@article{GDZPPN001259369, title = {Ordered semigroups containing minimal and maximal elements.}, journal = {Semigroup forum}, volume = {37}, year = {1988}, pages = {225-232}, zbl = {0639.06011}, url = {http://dml.mathdoc.fr/item/GDZPPN001259369} }
Satyanarayana, M. Ordered semigroups containing minimal and maximal elements.. Semigroup forum, Tome 37 (1988) pp. 225-232. http://gdmltest.u-ga.fr/item/GDZPPN001259369/